Postbox is a slick, modern-looking email client that provides a rich set of tools to help you get more from your messages. Postbox helps you make the most of your email, offering powerful new ways to find, use, and view email messages and content, organize your work life, and get stuff done.

Postbox features include:

All Your Accounts in One Place -- Postbox Account Groups let's you organize accounts into groups.

Conversations Views — just like Gmail.

Postbox Topics — this takes tagging to a whole new level.

Great Gmail Support — labels, important, send, archive, shortcuts and the calendar!